A charter school is an independently run public school granted greater flexibility in its operations, in return for greater accountability for performance. The “charter” establishing each school is a performance contract detailing the school’s mission, program, students served, performance goals, and methods of assessment. Charter schools are public schools of choice, meaning that families choose them for their children. They operate with freedom from some of the regulations that are imposed upon district schools. Charter schools are accountable for academic results and for upholding the promises made in their charters. They must demonstrate performance in the areas of academic achievement, financial management, and organizational stability. If a charter school does not meet performance goals, it may be closed. Charter schools can vary a great deal in their design and in their results. Uncommon Schools for instance creates schools based on the principles and practices that have proven successful in producing significant academic gains at high-performing urban charter public schools across the country. Uncommon schools share the following key attributes: a college preparatory mission; high standards for academics and character; a highly structured learning environment; a longer school day and a longer school year; a focus on accountability and data-driven instruction; and a faculty of committed and talented leaders and teachers. Schools within the Uncommon network are modeled on some of the highest-performing urban public charter schools in the country. Website: http://www.uncommonschools.org/ Answering to opponents